Lock



E. N. JACOBI July 10, 1934;

LOCK

Filed June 9, 1335 Patented July 10, 1934 UNITED STATES PATENT OFFICE LOCK Application June 9, 1933, Serial No. 674,992

Claims.

This invention relates to certain new and useful improvements in locks and refers more particularly'to key controlled tumbler locks in which a lock cylinder having a plurality of key operable tumblers is rotatably mounted within a barrel or casing. I

It is an object of this'invention to provide improved and simplified means for retaining the lock cylinder in its casing or barrel.

Another object of this invention is to provide common means for retaining the lock cylinder in its casing and to define the limitsof rotation of the cylinder.

With the above and other objects in view which will appear as the description proceeds, my in vention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes in the precise embodiment of the hereindisclosed invention may be made as come within the scope of the'claims.

In the accompanying drawing, I have illustrated one complete example of the physical embodiment of my invention constructed according to the best mode I have so far devised for the practical application of the principles thereof, and in which:

Figure 1 is a side elevation of a lock embodying this invention;

Figure 2 is a rear view of the lock; and

Figure 3 is a detailsection View taken on the plane of the line 3-3 of Figure 2.

Referring now more particularly to the accompanying drawing in which like numerals indicate like parts throughout the several views, the numeral 5 represents a casing or barrel bored as'at 6 to receive a lock cylinder '7. The casing 5 is provided with the usual tumbler grooves 8 communicating with its bore 6 into one of which the ends of tumblers 9 are urged to secure the lock cylinder against rotation in the customary manner, the tumbler-s 9- being retractable upon the insertion of a proper key 10.

Various methods have been employed to retain the lock cylinder "7 in" its casing or barrel, and the present invention contemplates an improvement over such past schemes. In accordance with this invention, the lock cylinder is inserted from the rear and its front end portion is reduced in diameter to define a shoulder 11 which abuts the inner surface of a sheet metal cap 12 secured overthe outer end of the casing. The cap 12 is attached to the casing by spinning its peripheral edge portion 13 over the rear of a flange 14 formed as an integral part of the casing, The front wall 15 of the cap against whose inner face the shoulder 11 abuts, has a central opening 16 to permit the projection therethrough of the reduced front end portion 17 of the lock cylinder.

It is observed that the front wall 15 of the cap not only serves as an abutment to limit the forward longitudinal motion of the lock cylinder, but also covers the open front ends of the tumbler grooves 8.

The rear end of the lock cylinder 7 projects a slight distance from the rear of the casing and has a raised projection 18 defining a shoulder 19 which extends substantially diametrically across the cylinder end.

A radial arm or extension 20 is formed as an integral part of the rear end of the cylinder to which an element 21 may be secured to translate the rotary motion of the cylinder into any desired locking action.

Extended from the rear end of the casing or barrel is a quadrant 22. The inside surface of this quadrant is a continuation of the cylindrical surface of the bore in the casing and at its point of-attachment to the casing proper, the quadrant is weakened by an under-cut groove 23. After the cylinder has been assembled with the casing, the quadrant is bent toward the axis of the cylinder until the sharp edge 24 of the ledge formed by the groove 23 overhangs the rear end of the cylinder a distance suiiicient to preclude rearward withdrawal of the cylinder. 7

The groove 23 in the quadrant not only facilitates the bending down of the quadrant to overlie the rear end of the cylinder, but permits this deflection without deforming the casing proper or in any way causing the cylinder to bind. Also because of the sharpness of the edge 24, a well defined abutment is obtained so that the clearance or endwise play of the lock cylinder may be nicely determined.

It is observed, particularly from Figure 2, that after the quadrant has been bent into its cylinder retaining position, its opposite ends 25 and, 26 lie in the path of the opposite end portions of the shoulder 19 so as to collide therewith and in this manner determine the limits of rotation of the cylinder. In the present instance, the lock. is designed for ninety degrees of rotation of the cylinder, but it is readily apparent that where one. hundred and eighty degrees of rotation is desired, the projection 18 may be formed to accom modate this additional motion.

From the foregoing description taken in connection with the accompanying drawing, it will be readily apparent to those skilled in the art that this invention afiords an exceedingly simple but efiective manner of securing a lock cylinder in its casing or barrel and that it also .provides simple means for defining the limits of rotation of the cylinder.

What I claim as my invention is:

1. In a lock, a bored casing, a lock cylinder inserted into said casing here from one end there of, and means to hold the cylinder in the casing comprising, a segmental projection formed on the casing and having a ledge, the projection being bent inwardly so that its ledge overhangs the adjacent end portion of the cylinder.

2. In a look, a casing having a bore, a lock cylinder in said bore, a fixed abutment at one end of the casing to limit axial movement of the cylinder in one direction, and means to limit axial movement of the lock cylinder in the other direction, comprising a segmental projection formed on the casing and provided with a ledge to overhang the adjacent end of the cylinder, said projection being bent out of its normal I position to dispose the ledge in the path of the cylinder end with a sharp edge of the projection engageable with the cylinder end.

3. In a lock, a casing having a bore, a lock cylinder in said bore, a fixed abutment at one end of the casing to limit axial movement of the cylinder in one direction, and means to limit axial movement of the lock cylinder in the other direction, comprising a projection extending from the casing, said projection being substantially in the form of a sector and having a slot in its under surface to define a ledge, and being bent so as to position said ledge inwardly of the circumference of the cylinder to be engageable with the adjacent end of the cylinder.

4. In a look, a. casing having a bore, a lock cylinder in said bore, a fixed abutment at one end of the casing to limit axial movement of the cylinder one direction, and means to limit axial movement of the lock cylinder in the other direction, comprising a segmental projection on the casing, having an inner surface coinciding with the bore in the casing and having a slot in its under surface adjacent its point of attachment to the casing to define a ledge, and said segmental projection being bent toward the axis of the cylinder to dispose said ledge inwardly of the circumference of the cylinder to be engageable by the end of the cylinder.

5. In a look, a casing having a bore, a lock cylinder in said bore, a fixed abutment at one end of the casing to limit axial movement of the cylinder in one direction, and means to limit axial movement of the lock cylinder in the other direction, comprising a segmental projection on the casing, having an inner surface coinciding with the bore in the casing and'having a slot in its under surface adjacent its point of attachment to the casing to define a ledge, and said segmental projection being bent toward the axis of the cylinder to dispose said ledge inwardly of the circumference of the cylinder to be engageable by the end of the cylinder, and a projection on said end of the cylinder defining .a shoulder which is engageable with the opposite ends of said projection to define the limits of rotation of the lock cylinder.

6. In a look, a casing having a bore, a lock cylinder mounted therein, means to hold the lock cylinder in the bore including a segmental projection having a ledge projecting inwardly of the circumference of the cylinder to be engageable by the adjacent end of the cylinder, and abutments on said end of the cylinder engageable with the opposite ends of said segmental projection to define the limits of rotation of the lock cylinder.

7. In a lock of the character described, a bored casing, a cap attached to the casing and having a part thereof partially closing one end of the bore, a lock cylinder inserted into the casing bore from its other end and having a part engaging said cap part to prevent axial movement of the lock cylinder in one direction, and means formed as an integral part of the casing and bent into an operative position to limit axial movement of the lock cylinder in the other direction.

8. In a lock of the character described, a casing having a bore, a sheet metal finishing cap attached to one end of the casing and having a wall partially closing the adjacent end of the bore, a lock cylinder inserted into the bore from its opposite open end and having a part engaging said obstructing wall of the cap, and a projection formed as an integral part of the casing and provided with a ledge, said projection being bent to dispose its ledge inwardly of the circumference of the cylinder to be engageable by the adjacent end portion of the cylinder.

9. In a lock, a casing having a bore partially closed at one end, a look cylinder inserted into the bore through its open end, and means to prevent retraction of the lock cylinder from its open end comprising, a quadrant formed as an integral part of the casing and projecting therefrom, said quadrant having a groove in its wider surface adjacent its point of attachment to the casing to weaken the same and to define a ledge, and said quadrant being bent to position its ledge inwardly of the circumference of the cylinder.

10. In a look, a bored casing, a lock cylinder inserted into said casing bore from one end thereof, and means to hold the cylinder in the casing comprising, a segmental projection formed on the casing and extended endwise beyond one end of the cylinder, said projection having a slot in its undersurface to define a ledge which, together with the undersurface of the projection, forms a sharp edge and said projection being bent inwardly toward the axis of the cylinder to dispose said sharp edge in the path of the cylinder end and substantially in the plane of said cylinder end, said sharp edge of the projection moving toward the plane of the cylinder end during the bending of the projection whereby its position relative to the plane of the cylinder end may be accurately located to insure proper endwise clearance for the cylinder.

EDWARD N. JACOBI, 

